The experiments require online monitoring of the physical and chemical measurements with delays of only a few seconds.

Each campaign requires high flexibility and fast response to changes in instrument configuration or experimental parameters. The DAQ system needs to be highly adaptable to allow a fast setup over a single installation week at the start of each campaign, when the instruments are brought to CERN and installed at the CLOUD chamber. The central function of the CLOUD DAQ (data acquisition) system is to combine the data from these autonomous and inhomogeneous instruments into a single, integrated CLOUD experiment database. The set of instruments changes for each experimental campaign according to the scientific goals. The experiment comprises an ultraclean 26 m3 chamber and its associated systems (the CLOUD facility) together with a suite of around 50 advanced instruments attached to the chamber via sampling probes to analyze its contents.

The CLOUD (Cosmics Leaving OUtdoor Droplets) experiment at CERN (the European Organization for Nuclear Research) is investigating the nucleation and growth of aerosol particles under atmospheric conditions, and their activation into cloud droplets.

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